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PRINCIPAL CLIENTS (Tables)
 6 Months Ended
Jun. 30, 2016
Risks and Uncertainties [Abstract]  
Schedule of Revenue by Major Customers
The following table represents revenue concentration of our principal clients:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
T-Mobile USA, Inc.
 
$
17,045

 
23.1
%
 
$
17,033

 
26.8
%
 
$
33,062

 
21.8
%
 
$
35,123

 
27.6
%
Sprint / United Management Co.
 
$
11,257

 
15.3
%
 
$
3,162

 
5.0
%
 
$
22,129

 
14.6
%
 
$
3,162

 
2.5
%
AT&T Services, Inc. and AT&T Mobility, LLC
 
$
9,734

 
13.2
%
 
$
8,070

 
12.7
%
 
$
20,221

 
13.3
%
 
$
18,810

 
14.8
%
Comcast Cable Communications Management, LLC
 
$
7,025

 
9.5
%
 
$
7,930

 
12.5
%
 
$
14,241

 
9.4
%
 
$
16,809

 
13.2
%